I am 18 years old and just had sex for the first time 2 days ago. My last period was from Feb. 16-20th. This guy and i had sex and we used a condom. Halfway through I decided i had wanted to leave, but then decided I would stay with him. He had already taken the condom off and didn't have another one, so i made him put the first one back on. I'm not sure if he put it on inside out. I think he might of. I know my period does not come until the end of next week, butI'm freaking out now. Since he could have possibly put the condom on inside out, could hat affect my chances of getting pregnant? Also, I'm not sure if he pre-ejactulated into the condom, therefore if he put it on inside out and that sperm was inside me, could that allow me to get pregnant? Like i said I'm a nervous wreck. I have been stressed out for 2 days now and have gotten very little sleep over this. I'm afraid this stress might cause my period to come late, or not at all. Can anyone please help?